Why not simply convert the ease keyframes to bezier interpolation and then drag out the handle asymmetrically to get the effect you want? (Not sure you would want to break the handles as that would give you a noticeably jump rather than an ease type animation.)

[Simon Ubsdell] Why not simply convert the ease keyframes to bezier interpolation and then drag out the handle asymmetrically to get the effect you want?

Too fiddly. This is how I ended up doing it after I posted this question, but when you're trying out various in+out combinations and the client says 'let's see it at 65 35 again', you actually have to go and manipulate the handles again, as opposed to just keying in the numbers. And with savvy clients, it needs to be just right every time, as if it's off even a little, they can tell.

Personally, I feel that manipulating the curve handles is great for when you're finessing your animations, but when you're in look dev, it's a drag, and has an impact on the interactivity of the process. And as everything's so fast in Motion, slow-downs are even more obvious than in say something like AE.

[Sandeep Sajeev]"Too fiddly. This is how I ended up doing it after I posted this question, but when you're trying out various in+out combinations and the client says 'let's see it at 65 35 again', you actually have to go and manipulate the handles again, as opposed to just keying in the numbers. And with savvy clients, it needs to be just right every time, as if it's off even a little, they can tell. "